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Related Experiment Videos

Serial defibrillation threshold measures in man: a prospective controlled study

J E Poole1, G H Bardy, G L Dolack

  • 1University of Washington Medical Center, Department of Medicine, Seattle, USA.

Journal of Cardiovascular Electrophysiology
|January 1, 1995
PubMed
Summary
This summary is machine-generated.

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Defibrillation threshold (DFT) changes after implantable cardioverter defibrillator (ICD) surgery were studied. Strict criteria limited analysis to 20 patients, showing variable DFT over 52 weeks.

Area of Science:

  • Cardiology
  • Biomedical Engineering

Background:

  • Defibrillation threshold (DFT) may change post-cardioverter defibrillator implantation.
  • The cause of DFT changes (clinical vs. electrode-tissue interface) is unclear.

Purpose of the Study:

  • To assess DFT changes over one year post-implantable cardioverter defibrillator (ICD) surgery.
  • To exclude confounding clinical and device variables affecting DFT.

Main Methods:

  • Prospective study of 61 patients receiving epicardial or transvenous ICDs.
  • DFT measured at implant, 1, 6, 12, and 52 weeks.
  • Strict exclusion criteria ensured data integrity, with only 20 patients completing the study.

Main Results:

  • Only 20 of 61 patients met study criteria.

Related Experiment Videos

  • Two patients required reprogramming due to high DFTs.
  • Eight patients had epicardial leads; 12 had nonthoracotomy systems.

    • Conclusions:

    • High exclusion rate suggests challenges in maintaining stable conditions for serial DFT measurement.
    • Further research needed to understand long-term DFT stability and its determinants.